Home Home > GIT Browse
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorEric Dumazet <edumazet@google.com>2017-03-24 19:36:13 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-04-30 05:49:29 +0200
commitb7f47c794bc45eae975bf2a52a4463333111bb2a (patch)
tree454601c82abd8c444ce9c496b80853e427095820
parenta7544fdd1626b65db635022c9d36007bb32dd6d8 (diff)
ping: implement proper locking
commit 43a6684519ab0a6c52024b5e25322476cabad893 upstream. We got a report of yet another bug in ping http://www.openwall.com/lists/oss-security/2017/03/24/6 ->disconnect() is not called with socket lock held. Fix this by acquiring ping rwlock earlier. Thanks to Daniel, Alexander and Andrey for letting us know this problem. Fixes: c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Daniel Jiang <danieljiang0415@gmail.com> Reported-by: Solar Designer <solar@openwall.com> Reported-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/ipv4/ping.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 3a00512addbc..37a3b05d175c 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -154,17 +154,18 @@ void ping_hash(struct sock *sk)
void ping_unhash(struct sock *sk)
{
struct inet_sock *isk = inet_sk(sk);
+
pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
+ write_lock_bh(&ping_table.lock);
if (sk_hashed(sk)) {
- write_lock_bh(&ping_table.lock);
hlist_nulls_del(&sk->sk_nulls_node);
sk_nulls_node_init(&sk->sk_nulls_node);
sock_put(sk);
isk->inet_num = 0;
isk->inet_sport = 0;
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
- write_unlock_bh(&ping_table.lock);
}
+ write_unlock_bh(&ping_table.lock);
}
EXPORT_SYMBOL_GPL(ping_unhash);